US20150376737A1 - Copper-zinc alloy for a plumbing fitting and method for the production thereof - Google Patents

Copper-zinc alloy for a plumbing fitting and method for the production thereof Download PDF

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Publication number
US20150376737A1
US20150376737A1 US14/847,645 US201514847645A US2015376737A1 US 20150376737 A1 US20150376737 A1 US 20150376737A1 US 201514847645 A US201514847645 A US 201514847645A US 2015376737 A1 US2015376737 A1 US 2015376737A1
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US
United States
Prior art keywords
copper
zinc alloy
plumbing fitting
alloy
components
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Abandoned
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US14/847,645
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English (en)
Inventor
Thomas Schroeder
Olaf Petzoldt
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Grohe AG
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Grohe AG
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Assigned to GROHE AG reassignment GROHE AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PETZOLDT, OLAF, SCHROEDER, THOMAS
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/04—Alloys based on copper with zinc as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/02—Plumbing installations for fresh water
    • E03C1/021—Devices for positioning or connecting of water supply lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K51/00—Other details not peculiar to particular types of valves or cut-off apparatus
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/02—Plumbing installations for fresh water
    • E03C1/04—Water-basin installations specially adapted to wash-basins or baths

Definitions

  • the present invention relates to a copper-zinc alloy (or brass alloy) for a plumbing fitting as well as a method for the production thereof.
  • a copper-zinc alloy or brass alloy
  • it concerns a cast alloy, with the aid of which water-conducting components and/or water-contacting components of a plumbing fixture may be produced.
  • dezincification resistance is determined, in particular, by a material test according to ISO 6509.
  • the material here is immersed in a 75° C. copper chloride bath (CUCl 2 ) with a concentration of 12.7 grams of CuCl 2 to one liter of water (H 2 O) for a period of 24 hours.
  • the depth to which the zinc ions are discharged is then determined. The shallower this dezincification depth, the better suited this material is for delivering drinking water.
  • a copper-zinc alloy of this type has a preferably small proportion of silicon (Si). It may thus be ensured that the alloy may be mixed with the standard brass alloys in the standard production process and thus be recycled.
  • an object of the present invention is to provide a copper-zinc alloy, which at least partially solves the problems illustrated at the outset.
  • a copper-zinc alloy should be suitable for use in a plumbing fitting.
  • an advantageous plumbing fitting as well as a method for the production thereof are to be provided.
  • FIGURE illustrates a plumbing fixture.
  • the copper-zinc alloy comprises:
  • the specified lead content (Pb) of this copper-zinc alloy is very small. It should furthermore be noted that the copper content (Cu) is also low compared to known alloys. It should likewise be pointed out that the copper-zinc alloy has only a (negligible) content of silicon (Si). It has surprisingly turned out that this copper-zinc alloy is more cost-effective, on the one hand, due to the composition selected herein, and also has an excellent dezincification resistance, namely to a dezincification depth of less than 200 ⁇ m (micrometers), in particular even less than 100 ⁇ m.
  • the copper-zinc alloy specified herein is, in particular, a so-called cast alloy.
  • the lead proportion (Pb) causes an adequate improvement in the machineability of the cast alloy. It is furthermore known that lead has a positive effect on the dezincification resistance. It was determined that a noteworthy grain-refining effect exists.
  • the grain refinement causes the proportion of the less acid-resistant beta brass contained in the brass to be distributed in the dezincification-resistant alpha brass matrix in a fine and isolated, island-shaped manner. It is preferred for the lead proportion to be in a partial range which is close to the upper limit, for example in a range from 0.19 to 0.2 wt %.
  • the aluminum (Al) increases the strength of the alpha phase and the beta phase, in particular due to solid-solution hardening, without significantly influencing the hot workability. It furthermore improves the resistance to erosion corrosion as well as the tarnish and weather resistance. Aluminum also increases the strength in order to achieve a high surface quality, especially in cast products. In test series, aluminum demonstrated a negative effect on the dezincification resistance. The relatively small aluminum proportion induces a formation of the less acid-resistant beta brass proportionate to surface area. The beta brass solid solution proportion reduced in this way is better distributed in the dezincification-resistant alpha brass matrix in an isolated island-shaped manner. Above the specified upper limit, the dezincification resistance values deteriorated significantly. If the specified lower limit fails to be reached, the physically and economically positive effects of the aluminum are no long extensively used.
  • arsenic promotes the fact that the copper zinc alloy does not undergo significant zincification with the standard (alpha) phase.
  • arsenic also had a positive effect on the characteristic of dezincification resistance.
  • the increased arsenic proportion compared to the conventional standard brass, causes a lesser formation of the less acid-resistant beta brass proportionate to surface area.
  • One explanation for the positive effects of arsenic on dezincification resistance may be its action as an inhibitor with respect to the chemical attack of the acids used in the dezincification test.
  • the upper limit of 0.13 wt % was also selected, in particular, by taking into account the target parameters mentioned at the outset.
  • the lower limit of 0.11 wt % is the result of test series. A significant deterioration of the dezincification resistance occurred below this limit.
  • the arsenic proportion to be in a partial range which is close to the upper limit, for example in a range from 0.12 to 0.13 wt %.
  • the proposed iron content (Fe) supports, in particular, a grain refinement, due to primarily precipitated iron crystals, and thus improves the mechanical properties of the components.
  • iron had a positive effect on the characteristic of dezincification resistance. This may be explained by the proven grain-refining effect.
  • the grain refinement causes the iron proportion of the less acid-resistant beta brass contained in the brass to be distributed in the dezincification-resistant alpha brass matrix in a fine and isolated, island-shaped manner.
  • the upper limit of 0.2 wt % was set because higher iron values may induce the formation of hard inclusions.
  • the explanation therefor lies in the relatively high melting point of iron. Hard inclusions result in surface defects which are not accepted for surface-mounted fittings.
  • the lower limit of 0.16 wt % is the result of test series. A significant deterioration with regard to dezincification resistance occurred below this limit. It is preferred for the iron proportion to be in a partial range which is close to the upper limit, for example in a range from 0.18 to 0.20 wt %.
  • the tin content (Sn) increases the corrosion resistance (by forming a cover layer), in particular in single-phase (alpha) copper-zinc alloys, and improves, in particular, the strength and/or antifriction properties.
  • the upper limit of 0.2 wt % was set because, in addition, no positive effects on the corrosion resistance could be established.
  • the lower limit of 0.0 wt % is the result of test series and the fact that, depending on the input material, very little or no tin may be contained therein.
  • the manganese content proposed here improves the mechanical properties and corrosion resistance, in particular, to weather influences or moisture.
  • the upper limit of 0.02 wt % was set to avoid any problems involving hard inclusions that may occur. This limit was also set on the basis of the content that experience has shown will set in during melting.
  • residual constituents may also be provided, it being possible for these constituents to comprise specific alloy elements as well as (unavoidable) impurities.
  • Each of these residual constituents is permitted with a maximum content of 0.02 wt %.
  • the total quantity of all residual constituents should not exceed, in particular, the value of 0.2 wt %.
  • the copper-zinc alloy having the content ranges specified here should be selected in such a way that the total quantity of the alloy constituents results in 100 wt %.
  • the copper-zinc alloy contains no silicon (Si).
  • the proposed copper-zinc alloy is used, in particular, for a plumbing fitting.
  • water-conducting components and/or components exposed to water may be provided with a copper-zinc alloy of this type.
  • the components may be, in particular, cast components. Examples of components of this type are housing components, rings, sleeves and the like.
  • a plumbing fitting which includes a housing component that forms at least one outer surface or which comprises an inner surface for a water channel, is designed in such a way that at least the outer surface or the inner surface is formed with the aid of the copper-zinc alloy.
  • the surfaces of the housing component which are moistened by water and/or which conduct water are addressed hereby.
  • the outer surface as well as the inner surface of the housing component are formed with the aid of the copper-zinc alloy, for example, if the housing component is cast as a single piece. Irrespective thereof, it is possible to also provide a protective layer on the outer surface and/or the inner surface, in particular with regard to the visual design and/or the additional improvement of the corrosion protection.
  • a method is furthermore proposed for producing a cast component from a copper-zinc alloy, comprising at least the following steps:
  • a casting method is specified hereby, wherein the cast component is subsequently subjected to another heat treatment.
  • the holding time is exceptionally preferably in a range from 40 minutes to 70 minutes, exceptionally preferably in a range from 50 minutes to 65 minutes.
  • FIGURE illustrates an example embodiment, showing a cross-sectional view of an adjustment fitting with sealing of the eccentric receiving space.
  • the specified example is characterized by an excellent dezincification resistance, a composition being simultaneously present, which may be easily recycled with other brass components.
  • This alloy has a very high copper content (approximately 76 wt %) and is therefore very expensive.
  • the equally high silicon content of approximately 4 wt % results in enormous problems when mixed with conventional alloys; in particular, the danger of inclusion-comprising silicon oxide arises.
  • the recyclable material must therefore be strictly separated, and only input materials of one type may be used. In practice, a foundry must used either separate furnaces or crucible melting furnaces which have removable inserts for mixtures of CuZn21Si3P and other materials.
  • This brass has a lead content of up to 1.6 wt % and may therefore not be classified as lead-free brass.
  • FIG. 1 shows a housing component 2 , formed in a single piece, for a plumbing fitting.
  • Housing component 2 forms an outer surface 3 , which is visible, for example, to the operator.
  • Housing component 2 furthermore forms an inner surface 4 , with the aid of which water channel 5 is formed.
  • Housing component 2 is exceptionally preferably a cast component made of the copper-zinc alloy according to the invention.
  • the copper-zinc alloy as well as components produced therewith allow a particularly environmentally friendly and cost-effective provision of plumbing fittings.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Health & Medical Sciences (AREA)
  • Domestic Plumbing Installations (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Contacts (AREA)
  • Table Devices Or Equipment (AREA)
  • Conductive Materials (AREA)
US14/847,645 2013-03-07 2015-09-08 Copper-zinc alloy for a plumbing fitting and method for the production thereof Abandoned US20150376737A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102013003817.0A DE102013003817A1 (de) 2013-03-07 2013-03-07 Kupfer-Zink-Legierung für eine Sanitärarmatur sowie Verfahren zu deren Herstellung
DE102013003817.0 2013-03-07
PCT/EP2013/001976 WO2014135180A1 (fr) 2013-03-07 2013-07-05 Alliage cuivre-zinc pour une robinetterie sanitaire, et procédé de fabrication de ladite robinetterie

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/001976 Continuation WO2014135180A1 (fr) 2013-03-07 2013-07-05 Alliage cuivre-zinc pour une robinetterie sanitaire, et procédé de fabrication de ladite robinetterie

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Publication Number Publication Date
US20150376737A1 true US20150376737A1 (en) 2015-12-31

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US14/847,566 Abandoned US20150376736A1 (en) 2013-03-07 2015-09-08 Copper-zinc alloy for a plumbing fitting and method for the production thereof
US14/847,645 Abandoned US20150376737A1 (en) 2013-03-07 2015-09-08 Copper-zinc alloy for a plumbing fitting and method for the production thereof

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Country Status (7)

Country Link
US (2) US20150376736A1 (fr)
EP (2) EP2964797B1 (fr)
CN (2) CN105026585A (fr)
DE (1) DE102013003817A1 (fr)
ES (1) ES2620088T3 (fr)
RU (1) RU2015135237A (fr)
WO (2) WO2014135180A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10240325B1 (en) * 2017-09-28 2019-03-26 Xiamen Lota International Co., Ltd. Mounting structure for faucet body and shaft

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014106933A1 (de) * 2014-05-16 2015-11-19 Otto Fuchs Kg Sondermessinglegierung und Legierungsprodukt
JP2016113660A (ja) * 2014-12-13 2016-06-23 サンエツ金属株式会社 耐脱亜鉛腐食性に優れた金型鋳造用銅基合金
JP6056947B2 (ja) * 2015-01-28 2017-01-11 Toto株式会社 鋳造性および耐食性に優れた黄銅
EP3050983B1 (fr) * 2015-01-28 2019-03-13 Toto Ltd. Laiton ayant une coulabilité améliorée et une résistance à la corrosion
CN104745863B (zh) * 2015-04-08 2017-09-08 九牧厨卫股份有限公司 一种适用于铸造的低铅耐脱锌黄铜合金
CN105543548A (zh) * 2015-12-22 2016-05-04 路达(厦门)工业有限公司 一种铸造用低成本无铅抗脱锌黄铜合金
DE102017118386A1 (de) 2017-08-11 2019-02-14 Grohe Ag Kupferlegierung, Verwendung einer Kupferlegierung, Sanitärarmatur und Verfahren zur Herstellung einer Sanitärarmatur
US11427891B2 (en) 2019-07-24 2022-08-30 Nibco Inc. Low silicon copper alloy piping components and articles
DE102020101697A1 (de) * 2020-01-24 2021-07-29 Lixil Corporation Verfahren zur additiven Herstellung eines entzinkungsbeständigen Messing-Bauteils für eine Sanitärarmatur

Citations (1)

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Publication number Priority date Publication date Assignee Title
GB1407494A (en) * 1971-09-09 1975-09-24 Nordiske Kabel Traad Method of imparting increased dezincification-resistance to brass

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10240325B1 (en) * 2017-09-28 2019-03-26 Xiamen Lota International Co., Ltd. Mounting structure for faucet body and shaft

Also Published As

Publication number Publication date
US20150376736A1 (en) 2015-12-31
RU2015135237A (ru) 2017-03-03
EP2964798A1 (fr) 2016-01-13
DE102013003817A1 (de) 2014-09-11
CN105026585A (zh) 2015-11-04
EP2964797B1 (fr) 2017-02-01
WO2014135180A1 (fr) 2014-09-12
EP2964797A1 (fr) 2016-01-13
EP2964798B1 (fr) 2017-09-13
WO2014135181A1 (fr) 2014-09-12
CN105026586A (zh) 2015-11-04
ES2620088T3 (es) 2017-06-27

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Owner name: GROHE AG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SCHROEDER, THOMAS;PETZOLDT, OLAF;SIGNING DATES FROM 20160127 TO 20160423;REEL/FRAME:038464/0058

STCB Information on status: application discontinuation

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